[WIP] Project root resolution

[alcuadrado]

This PR revamps how we manage the project root resolution and how it impacts other parts of the system.

The project root in Hardhat v3 will be the root of the npm package containing the Hardhat config file, or the one containing the CWD if an instance of the HRE is initialized without using a config file.

This PR touches several files, so here's a summary of the changes:

• The base HRE constructor in the core package now accepts an optional projectRoot.
• There's now a resolveProjectRoot helper exposed in core.
• Plugin installation error detection is now run based on the project root, as plugins and their dependencies should all be installed in the npm package containing the project.
• I added that same error detection logic to the hook manager, because loading actions can fail.
• The three ways to initialize the HRE (the cli, importing hardhat, and using createHardhatRuntimeEnvironment) were updated according to the new project root logic.
• I implemented a small change to the /package module in the utils package.

I'm marking this as WIP as I still haven't added tests for the new functionality yet.

Fixes #5436

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Name	Status	Preview	Comments	Updated (UTC)
hardhat	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 23, 2024 2:22pm

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[zoeyTM]

Pre-approving before tests are added, but I think this looks good!

[schaable]

LGTM, just left a minor comment about parameter order